Ticket 2010 - Does Slurm store uid/gid cache?
Summary: Does Slurm store uid/gid cache?
Status: RESOLVED INFOGIVEN
Alias: None
Product: Slurm
Classification: Unclassified
Component: slurmctld (show other tickets)
Version: 14.11.9
Hardware: Linux Linux
: 4 - Minor Issue
Assignee: David Bigagli
QA Contact:
URL:
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Blocks:
 
Reported: 2015-10-05 21:59 MDT by Akmal Madzlan
Modified: 2015-10-06 00:40 MDT (History)
3 users (show)

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Description Akmal Madzlan 2015-10-05 21:59:20 MDT 
[akmala@kud6 ~]$ scontrol update jobid=3280512 partition=teamredang
User's group not permitted to use this partition for job 3280512

[root@kque0001 ~]# id akmala
uid=1509(akmala) gid=2110(teambond) groups=2110(teambond),2109(teamredang)

[2015-10-06T12:09:02.207] _slurm_rpc_update_job JobId=3280512 uid=1509: User's group not permitted to use this partition


Did Slurm store uid/gid cache?
Sometimes when users is added to a group, he still unable to use a partition until slurmctld is restarted

We dont have CacheGroups=1 in our config
Comment 1 David Bigagli 2015-10-05 22:12:08 MDT 
Yes it does, it keeps an array of uids to avoid calling getpwuid() functions.
I will check how this interacts with CacheGroups and get back to you.

David
Comment 2 David Bigagli 2015-10-05 22:13:37 MDT 
Akmal, I have added you in CC to this bugzilla report, you may have not got
my previous answer.

David
Comment 3 Akmal Madzlan 2015-10-05 22:16:21 MDT 
Thanks David
Comment 4 David Bigagli 2015-10-06 00:40:04 MDT 
Akmal the CacheGroups parameter applies to slurmd only. If you change the
user membership of a group you need to restart the controller indeed.
It would be possible to check the group membership on the fly but that
could affest the performance of the controller as the name resolution
routines can be slow especially if they have to call NIC, LDAP and so on.

David